[Python/Pandas] 리트코드 619. Biggest Single Number

문제

Table: MyNumbers
+-------------+------+
| Column Name | Type |
+-------------+------+
| num         | int  |
+-------------+------+
This table may contain duplicates (In other words, there is no primary key for this table in SQL).
Each row of this table contains an integer.
 
A single number is a number that appeared only once in the MyNumbers table.
Find the largest single number. If there is no single number, report null.

 

https://leetcode.com/problems/biggest-single-number/description/?lang=pythondata

예시

Input: 
MyNumbers table:
+-----+
| num |
+-----+
| 8   |
| 8   |
| 3   |
| 3   |
| 1   |
| 4   |
| 5   |
| 6   |
+-----+
Output: 
+-----+
| num |
+-----+
| 6   |
+-----+

Explanation: The single numbers are 1, 4, 5, and 6.
Since 6 is the largest single number, we return it.

문제 풀이

import pandas as pd

def biggest_single_number(my_numbers: pd.DataFrame) -> pd.DataFrame:
    return my_numbers.drop_duplicates(keep = False).max().to_frame(name = 'num')

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파이썬을 독학하시는 분들에게 도움이 되길 바라며,

혹 더 좋은 방법이 있거나 오류가 있다면 편하게 말씀 부탁드립니다.